Jackstand 

When one inserts a bottle of Jack Daniels into ones own rectum and proceeds to complete a handstand.

"I was so intoxicated following my second jackstand."

Jackstand by Bra2011120 January 11, 2012

jackstack

Smoking hot administrative assistant who makes up the thin line between loving your job and quiting.

I wasn't going to come to work today, but with jackstack around, it aint so bad.

jackstack by Beeyo November 1, 2007

Jacklanderseedes 

Jacklanderseedes (Jack-lander-see-these) is a rare kind of emerald usually found in central park.

I found Jacklanderseedes!

Jacklanderseedes by GokuAnanta_SSJB April 24, 2020

jackstall 

Pronounced jack-stal
Verb: To quit or pull out of something because you are rubbish at it.
Noun: Someone who frequently quits things or has recently quit something because they were doing badly.

'i got an E in Latin in the mock exam. I think I might jackstall it.'

'I'm rubbish at Latin, I think I might quit.'
'You're such a jackstall.'

jackstall by please accept. i cba try again December 27, 2016

Jackstain 

A stupid person described by a spot or spots of ejaculation.

"Paulie was busted after trying to buy weed from an undercover cop...he is a real jackstain."

Jackstain by Shawna123 September 2, 2005

Jacksyndrome 

When it’s past two o’clock in the morning you forget what happened the night before, feels like you’re drunk

I think I have jacksyndrome I don’t remember what I did on the bus

Jacksyndrome by Ghost0576 January 23, 2019

jackstack

A large stack of porngraphic magazines that one would use to masturbate to or jack-off to.

My girlfriend found my jackstack and wants me to add some lesbian magazines to it.

jackstack by Dan Brooks December 23, 2007